Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
If you ordered directly from Microsoft, your subscription product should already be in your account at https://account.microsoft.com/services . Click the Install button to install and active on your PC.
If you purchased from a third-party seller, you may have to go to https://setup.office.com , sign in with a Microsoft account and then enter a product key to create an association between your subscription product and your account. After that you can proceed with the install.